Center support



l Feb. 9,-1926.

1,572,072' ..uf Momma@ CENTER SUPPORT Filed may 18, 1925 y. WIM/11PM $7 Y nvVENTaK v ,o Jao Mona/70,

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Patented Feb. 9, 1926.

VIsraeli unirsnsra'rss earners esi-fies N JOSEPH MORENO, oFLLos Anennnsyeamronnra, Assienonon oran-HALF ro Amener4 Y 'MALLNEPW or Les Anual-ins, cams-onine.

CENTER SUPPORT.

i :application inea May 1s, 1925.

Be it known that l, Josnrn MORENO, a citizen of the United States, residing at Los Angeles, in the county et Los Angeles and State et Calitornia, have invented certain new anduse'ful improvements in Cen- 'er Supports, ot which thetollowing is a specification. y

nThis invention is a de vice adapted to be. readily liXed in the boreot a casting or the lileyin order to provide a support for the center ot" dividers, .'eoinpasses, or the like which are used in measuring or describing a circle around the bore ot' the casting. 'j

lt is the object ot the .invention-to provide a device otfextreinely simple construction which maybe quickly expanded for frictionally `holding` t-he same in a bore around which a circle is to be described, and which may be readily adjusted to ,tit in bores lof a wide range ot' size.

It is a still tui-,ther object ot the invention to torni the device ot a relatively hard material for they desired durability, and to provide a working surta j n soft material adapted to be engaged by the centers of Compasses and like instruments without injuring the points thereof.

It is a still further object of the invention to provide an instrument having relatively narrow contact ends, so that it may be placed in a here with the4 contact ends in close proximity to the walls thereof, in order that the contact ends may frictionally engage in the bore by relatively slight lon gitudinal expansion of the tool.

The invention will be readily understood -from the following description of the accompanying drawings showing one practical embodiment ot the invention:

Fig. l is a plan view showing the method of using the device in arelatively small bore.

Fig. 2 is a similar view showing the device adjusted for use in a larger bore.

Fig. 3 is a transverse section on the line 3--3 of Fig. 2.

Fig. 4 is a perspective view of the device.

The tool'is adapted to be mounted in any bore, and may be adjusted in length te any desired size and then lorngitudinall;v expanded to rietionally clamp the same in the bore and thus ,torni a support for the center of Compasses, dividers, or similar instriunents.

ce of relatively serial Ndh 31,047.

j 4The device preferably comprises a metal j block l `having projecting contact ends ot reduced width, with the major portion ot the upper surface oit block 'l recessed `toi` receive a layer ot relatively rsott material such as lead 3. j y

Expandingmeans shown as a screw et is; threaded into one ofthe contact ends 2and is preferably provided with a headv for turning the same. A contact plate 6 may `be mounted on theend of the screw so as to prevent axial displacement ot said plate while permitting .turning of the screw relative thereto.

The tool as thus described is used in relatively small bores, the narrow contact ends il permitting insertion oi the device in va here so that slight turning of screw 4 will `frictionally clamp contact plate G and the opposite end contact 2 against opposite yallsot the bore and thus hold the support against displacement with the center ot the bore at soule point on the working surtace j 3. A. circle may then bedescribed around the bore by centering the eompasseson the surface 3 ot the support, the use of a relatively sott material tor the working surface preventing injury to the points of the instruinents ywhich are used as a measuring or scribing medium.

End extensions are provided tor block l to adapt the device to hores of greater diameter, the end extensions being supplied in various lengths for any desired adjustment. The end V extensions are shown as yokes 7 having arms slidably engaging the sides ot block 1 by means of tongue and groove connections 8.' Shoulders: 9 of the yokes abut against the ends ol'pblocl; l atV the sides of the projecting contact ends 2, and the bases 10 ot the yoles extend around the projecting contact ends in spaced relation therefrom so that head 5 of the eX- `In practice extension yokes havingvends 2 ofthe desired length to adapt the support to the size of the borev are niountedion.

either one or both ends of block 1 `so` that seine point von Working surface 3 will be at the center of the bore, and screw 4; is then turned to longitudinally cXpandv the structure for clamping thesaine in the' bore, the Contact surfaces Which may engage the Walls of the bore including plat-e 6, andends 2 and 2, depending upon the/use ofpyokes 7 'at one or both ends of block l'.

It will be apparent that various changes may be made in the construction, combination, and arrangement ofA parts as thus described Withoutdeparting from ythe spirit of the invent-ion.

I claim: l Y 1. A device of the character described adapted to be received in a bore and com prising a supporting surface for the centers of coinpasses or thelike7 and a screw threaded inthe end ofthe device and having an end contact plate adapted for turning 'of theI screw relative thereto Without axial displacement. of the plate from the screw. whereby turning of the screw will engage the Contact plate and the opposite end of the device With the Wall of' the borel for clamping the supporting surface in the bore.

2. A. device of the character ydescribed prisinga supporting surfacev for the centers `tion having an end contact plate adapted for turning of the longitudinal projection relative thereto, whereby turning of the longitudinal projection will engage the con tact plate and theI opposite end'y of the device with the Wall of the" bore for clamping the supporting surface' in the bore. v

4. A device of 'the character described adapted tobe receivedy in a bore andv coniv` prising a supporting surface and'Y an end projection adapted for longitudinal adjustment by turning thereof relative to the supporting surface, and'y an end extension slid-` able relative to the`V supporting surface and received over the longitudinal projection for expansion relative1 tothe supporting' surface by turning of the longitudinal projection;

In testimony'whereof I' have afliixed my slg-naturetoltliis specification;A

JOSEPH Monnuo. 

